Dynamics of EEG Slow-Wave Activity and Core Body Temperature in Human Sleep After Exposure to Bright Light
Abstract
In seven subjects sleep was recorded after a single 3-hour (2100-0000 hours) exposure to either bright light (BL, approx. 2,500 lux) or dim light (DL, approx. 6 lux) in a crossover design. The latency to sleep onset was increased after BL. Whereas rectal temperature before onset and during the first 4 hours of sleep was higher after BL than after DL, the time course of electroencephalographic (EEG) slow-wave activity (SWA, EEG power density in the range of 0.75-4.5 Hz) in nonrapid eye movement sleep (NREMS) differed only slightly between the conditions. After BL, SWA tended to be lower than after DL in the first NREMS-REMS cycle and was higher in the fourth cycle at the time when the rectal temperature did not differ. The differences in SWA may have been due to a minor sleep-disturbing aftereffect of BL, which was followed by a rebound. The data are not in support of a close relationship between SWA and core body temperature.
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After 3 h of short-wavelength light exposure, CBT remained higher during the first half of the night, but not after dim light exposure.
“After 3 h of short-wavelength light exposure CBT remained higher during the first half of the night. This was not the case after dim light exposure [35].”
From Preliminary Results: The Impact of Smartphone Use and Short-Wavelength Light during the Evening on Circadian Rhythm, Sleep and Alertness (2021) · cites this paper as [35]
The findings corroborate previous results of a less pronounced nightly CBT course after 3 h of light exposure compared to dim light.
“Our findings further corroborate previous results that reported a less pronounced nightly CBT course after 3 h of light exposure (~2500 lux) compared to dim light (6 lux) exposure [35].”
From Preliminary Results: The Impact of Smartphone Use and Short-Wavelength Light during the Evening on Circadian Rhythm, Sleep and Alertness (2021) · cites this paper as [35]
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- Authors
- Cajochen, C., Dijk, D., & Borbély, A. A.
- Affiliations
- University of Zurich (CH)
- Corresponding author
- Alexander A. Borbély
- Venue
- Sleep
- Publisher
- Oxford University Press (OUP)
- Published
- 1992-07-01
- Volume
- 15
- Issue
- 4
- Pages
- 337-43
- ISSN
- 0161-8105 (ISSN-L)
- 1550-9109
- OpenAlex
- W2409109605
- Cited by
- 86
- References
- 0
- Citations by year
- 2025: 3 · 2024: 2 · 2023: 3 · 2022: 4 · 2021: 3 · 2020: 1 · 2019: 1 · 2018: 1 · 2017: 4 · 2014: 6 · 2013: 2 · 2012: 3
- FWCI
- 1.68
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- SLEEP (publishedVersion)
- PubMed (publishedVersion)
- Open Research (University of Surrey) (submittedVersion)
- Surrey Research Insight Open Access (The University of Surrey) (submittedVersion)
- Topics
- Life Sciences › Neuroscience › Cognitive Neuroscience › Sleep and Wakefulness Research
- Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Circadian rhythm and melatonin
- Social Sciences › Psychology › Experimental and Cognitive Psychology › Sleep and related disorders
- Keywords
- EEG slow-wave activity, core body temperature, bright light exposure, dim light exposure, sleep latency, NREM sleep, REM sleep, rectal temperature
- MeSH terms
- Adult, Analysis of Variance, Body Temperature, Brain, Electroencephalography, Humans, Male, Photic Stimulation, Sleep, Wakefulness
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